The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A256437 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A256437

Nonnegative integers i such that i^2 + reverse(i)^2 is a palindrome.
(history; published version)

#28 by Bruno Berselli at Fri Apr 10 09:46:39 EDT 2015

STATUS

reviewed

approved

#27 by Michel Marcus at Fri Apr 10 09:38:18 EDT 2015

STATUS

proposed

reviewed

#26 by Chai Wah Wu at Thu Apr 09 22:26:44 EDT 2015

STATUS

editing

proposed

#25 by Chai Wah Wu at Thu Apr 09 22:25:52 EDT 2015

PROG

(Python)

A256437_list = [i for i in range(10**6) if str(i**2 + int(str(i)[::-1])**2) == str(i**2 + int(str(i)[::-1])**2)[::-1]] # Chai Wah Wu, Apr 09 2015

STATUS

approved

editing

#24 by OEIS Server at Thu Apr 09 10:02:30 EDT 2015

LINKS

Bui Quang Tuan, <a href="/A256437/b256437_1.txt">Table of n, a(n) for n = 1..554</a>

#23 by Alois P. Heinz at Thu Apr 09 10:02:30 EDT 2015

STATUS

editing

approved

Discussion

Thu Apr 09

10:02

OEIS Server: Installed new b-file as b256437.txt.  Old b-file is now b256437_1.txt.

#22 by Alois P. Heinz at Thu Apr 09 10:01:13 EDT 2015

CROSSREFS

Cf. A002113, A004086, A256398.

STATUS

reviewed

editing

#21 by Danny Rorabaugh at Mon Apr 06 12:27:16 EDT 2015

STATUS

proposed

reviewed

Discussion

Mon Apr 06

13:04

Michel Marcus: All palindromes obtained in this way are terms of A256398 ?

13:09

Michel Marcus: All palindromes obtained in this way are terms of A256398, but they will not appear by increasing value ?
Well, probably needs rewording.

13:22

Michel Marcus: Or ?
The palindromes obtained in this manner are: 0,2,8,101,242,585,404,585,909,10001,20402,50805,12221,... all these belonging to A256398

#20 by Michel Marcus at Wed Apr 01 01:33:30 EDT 2015

STATUS

editing

proposed

#19 by Michel Marcus at Wed Apr 01 01:31:18 EDT 2015

PROG

(PARI) rev(n)=r=""; d=digits(n); for(i=1, #d, r=concat(Str(d[i]), r)); eval(r);

ispal(n) = d = digits(n); Vecrev(d) == d;

isok(n) = ispal(n^2+rev(n)^2) \\ Michel Marcus, Apr 01 2015

STATUS

proposed

editing